‘Glee’ kicks off its second season on Tuesday, September 21, and the Spears-centric hour – titled “Britney/Brittany” – is expected to air the following week, on September 28.

Though it was never guaranteed that Spears herself would appear in the episode – when last we heard from series boss Ryan Murphy, he said, “I think, 100 percent, [she] is going to be on” – Spears’ first Wednesday tweet did away with any doubt: “About to do my first shot of the day for Glee…. Here we goooo!”

“Britney/Brittany” features Spears’ music in performances born of anesthesia-induced fantasies entertained by assorted glee clubbers as they visit Emma’s dentist beau Carl, played by John Stamos. The smart money has Britney cameo-ing as Carl’s dental hygienist – and thus the last face the kiddies see before they go under.

For more on the episode, the video below has Emmy nominee Chris Colfer hinting at Kurt’s role in the Spearsgasm and revealing the two Brit hits he hopes to sing in the episode: